Linux Mint Forums

Dell N5010 Laptop...in either Mint Maya KDE, Mate, XFCE, Cinnamon (and actually Ubuntu 12.04, Bodhi as well)... when attempting to adjust backlight, whether by function keys or applet slider... if I don't dim/brighten it one "tick" at a time and then wait few seconds between each on completely settled session (completely booted and settled), and/or especially when just booted up... Mint freezes, and I have to manually power down (hold power button till off).

The only distro that I've tried so far that this doesn't happen in is SolusOS (maybe because not Ubuntu based???)... But I started out (after much research) as a Mint 11 user over a year ago, and love Mint! And like the Ubuntu repos compatibility, etc..

Currently posting from Maya Cinnamon.


Thanks in advance for your consideration and assistance.


P.S. I attached screenshot of sys details, but can't remember terminal command to get more detailed ones.

Have your tried to add acpi_backlight=vendor in GRUB at line?
reboot

wyrdoak wrote:Have your tried to add acpi_backlight=vendor in GRUB at line?

Code: Select all

 GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_backlight=vendor"

Code: Select all

sudo nano /etc/default/grub

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sudo update-grub

reboot

ABSOLUTELY PERFECT!


Thats it! But just for clarification, I am attaching screenshot to show... that there was already a line (you prob already knew it) in grub that read:


GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"


So I was only guessing that it would be better to alter it instead of adding other similar line that you suggested (was worried in my almost-smarter-than-I-look newbie mind that it might confuse grub process with 2 similar lines???). So... Altered already existing line to read:


GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_backlight=vendor"



((( never did this kind of edit before, but was able to figure out how to navigate, exit, save )))




MUCH THANKS and BEST TO YOU & YOURS!!!!

Glad it worked for you! Sorry my syntax confused you[was doing 3 things at once when I wrote it] but you did what I meant.

... the above grub edit has worked in the past (and still works on my Kubuntu 12.04), but now 15 Olivia Mate, when add above mod, just completely unable adjust backlight at all